or log in with
Pollution is the detrimental effect of human activity on the natural environment.
Reindeer are the northernmost deer species.
Darwin's legendary voyage aboard HMS Beagle played a crucial role in the development of the Theory of Evolution.
This animation demonstrates different types of volcanic eruptions
The ear converts the vibrations of air into electric signals which are then processed by the brain.
The world's most famous citadel, the Acropolis of Athens was built in the 5th century BC, during the Age of Pericles.
This animation demonstrates the type of engine most commonly used in cars.
Large carnivores, perhaps the best known of dinosaurs.
This animation introduces the most important organ systems of the human body.
This animation demonstrates how the Earth and the Moon were formed.
The round tower of the largest fort in the Arabian Peninsula had an ingenious defence system.
Visit the workshop of the Renaissance polymath and his most influential inventions and works of art.
The Forbidden City is one of the most magnificent and mysterious monuments of imperial China.
James Cook's legendary journey around the world proved to be enormously valuable for science.
The Bell X-1 was the first manned aircraft to exceed the speed of sound in level flight.
Banana is one of the most commonly consumed fruits in the world.
This early medieval burial site is one of the archaeological treasures of Anglo-Saxon culture.
The main sources of water pollution are industry, agriculture and urban areas.
Butyric acid (or butanoic acid) is a saturated monocarboxylic acid.
Terephthalic acid is an aromatic dicarboxylic acid.